At the The Cuckoo's Egg book, the writer explains how he were tracking a hacker at 1986. One of his ideas was adding a logger to the Shell executable and see every keystroke he pushes. In this Video, I'll try to add the same thing to the Bash and I will show you how you can study a source code and find your way around it. ... https://www.youtube.com/watch?v=nNADFHjLLRI

In this challenge we are facing a PNG file with no clue. We will look into its contents and reveal the flag step by step. We will use Python, PIL and CyberChef ... https://www.youtube.com/watch?v=DVkID9htax0

If you are new to CTFs or crypto challenges, this is a great start. This is an easy to understand and straight forward challenge in which we have to crack an encrypted message where we know part of the plaintext + length of the key. We will use Python as our main tool against aliens. ... https://www.youtube.com/watch?v=pvreYvRe-S0

All programming languages do have some common elements; inputs, functions, outputs, variables, ... . But there are also unique idea in some programming languages and if you want to know about them, you need to specifically study them. This is what makes a person proficient in a specific programming language. One of these is the usage of underscore ( the _ ) in Python programming. In this video I will show you 7 different usages of this character from a very trivial "digit separator" to a more cool "underscore as a dummy variable" and some more advanced topics like the meaning of __name__ == "__main__" which you might see in some source codes (and most of the libraries). Lets start and let's write better code! 00:40 - Underscore to separate digits in long numbers 01:40 - _ is the last result in IDLE 02:49 - underscore as dummy variable 04:52 - _ After python keywords as variable names 06:16 - Underscore before variable as a weak local 07:36 - two underscore before class members 08:45 - Variables with two underscores on both sides, like __name__ ... https://www.youtube.com/watch?v=ZCirxG9jrMo